strange frame deformation

[monchie]

Hello,

I have a simple 2d frame with horizontal point loads.
I'm just wondering why I have a strange deformation an huge displacement.
Pls. see attached file. Any help will be greatly appreciated.

 

[jowook]

The 2-D structure your model is not stable since your columns are moment released on every end of frames. Remove your moment releases and re-run on XZ plane.